8
pH CALIBRATION
• Connect the ORP electrode to the meter and
submerge the tip (4 cm / 1½") into the sample
to be tested.
Note: ORP measurements are taken without
temperature compensation.
• Press the
mV
key to enter the mV mode. Allow
a few minutes for the reading to stabilize.
• The display will indicate the mV value (positive
or negative).
AFTER MEASUREMENTS
• Press the
ON/OFF
switch to switch the instrument off.
IMPORTANT
The instrument's pH range should be re-calibrated:
• When the meter is new.
• Whenever the pH electrode is replaced.
• At least once a month.
• After use in aggressive chemicals.
• After cleaning procedure and changing the reference electrolyte.
• For greatest accuracy.
PREPARATION
Pour small quantities (up to 4 cm / 1½" level)
of pH7.01 (
HI7007
) and pH4.01 (
HI7004
) or
pH10.01 (
HI7010
) solution into clean beakers
(50 or 100 mL bottles). If possible use plastic
beakers to minimize any EMC interferences.
TAKING ORP MEASUREMENTS
HI2209
and
HI22091
have the capability to take ORP measurements,
using an ORP electrode. Hanna Instruments offers a variety of ORP
electrodes for this purpose (see accessories). Contact your local Hanna
Instruments Office for more information.
